A. K. Srivastav

Studies on 2-aminobenzophenone-2-thenolhydrazone complexes of some bivalent transition metal ions

SummaryComplexes having the chemical compositions [VO(Habth)2SO4], [M(Habth)2Cl2] [M=CoII, NiII, CuII or ZnII) and [M(abth)2] [M=VIVO, CoII, NiII, CuII or ZnII) and Habth=2-aminobenzophenone-2-thenoylhydrazone] have been prepared and characterized. The complexes are non-electrolytes. Magnetic moments and electronic, photoacoustic, e.s.r. and i.r. spectra of the complexes are used to establish the stereochemistry and mode of bonding of the hydrazone.

2-Aminoacetophenone-2-thenoylhydrazone complexes of bivalent 3d metal ions

Summary2-Aminoacetophenone-2-thenoylhydrazone, Haath, C4H3SC(O)NHN=C(Me)C6H4NH2-o, forms complexes with metal(II) salts of empirical compositions [VO(Haath)2SO4], [M(Haath)2Cl2] [M=CoII, NiII, CuII or ZnII] and [M(aath)2] [M=VIVO, CoII, NiII, CuII or ZnII] which have been characterized by elemental analyses, molar conductance, magnetic susceptibility, electronic, e.s.r., i.r. and n.m.r. (1H and13C) spectral studies. X-ray and electron diffraction patterns have been obtained in order to elucidate the structure of the CuII complexes. Photoacoustic spectra of powder NiII complexes have been recorded and interpreted in the light of u.v./vis. spectra.

Studies on 2-Acetylfuran-2-Thenoylhydrazone Complexes of Some Bivalent Metal Ions

Abstract 2-Acetylfuran-2-thenoylhydrazone, C4H3SC(O) NHNC(CH3)C4H3O (Hafth) yields the complexes VO(Hafth)2SO4, M(Hafth)2Cl2 [M = Mn(H), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II)] and M(afth)2(H2O)2 [M = VO(IV), Mn(II), Co(II), Ni(II), Cu(II) and Zn(II)] depending on the pH of the reaction medium. The complexes have been characterized by elemental analyses, molar conductance, magnetic susceptibility, electronic and photoacoustic, esr, ir, nmr (1H and 13C) and X-ray powder diffraction studies. Square pyramidal geometry for the OV(IV) complexes and octahedral geometry for the remaining complexes have been proposed.

Synthesis and Characterization of Pyrrole-2-Thiocarbgxamide Complexes with Some Bivalent Metal Ions

Abstract Pyrrole-2-thiocarboxamide, HNC4H3C(S)NH2 (ptca), complexes having 1:2 metal-ligand stoichiometry have been prepared and cnaracterized by elemental analyses, molar conductance, magnetic susceptibility, electronic, esr, ir and nmr (1H and 13C) spectral studies. Tetrahedral stereochemistry around Co(II), Ni(II), Zn(II), Cd(II) anHg(II) and five coordinate geometry around Cu(II) have been proposed on the basis of magnetic and spectral studies.

A new route to bimetallic azine-bridged complexes: synthesis and characterization of mononuclear (Mn, Co, Ni, Cu, Zn), homobinuclear (Zn-Zn) and heterobinuclear (Mn-Zn, Co-Zn, Ni-Zn, Cu-Zn) azine-bridged complexes

SummaryA novel unsymmetrical tetradentate azine, 2-acetyl-pyridinesalicylaldazine (Haps), was prepared by condensing salicylhydrazone with 2-acetylpyridine, and was characterized by elemental analysis and its i.r. spectrum. This ligand reacted with Mn, Co, Ni, Cu and Zn acetates to yield deprotonated M(aps)2(H2O)2 complexes. Subsequent reaction of the mononuclear unit Zn(aps)2(H2O)2 with MCl2 gave homo- [ZnCl2Zn(aps)2(H2O)2] and heterobinuclear [MCl2Zn(aps)2(H2O)2] type azine-bridged complexes, which were characterized by analytical, molecular weight, conductivity (solid and solution), magnetic susceptibility, and electronic, e.s.r. and i.r. spectroscopies, and X-ray powder diffraction data.

Template Synthesis and Characterization of Some Bivalent 3d Metal Complexes of Acetylacetone bis (2-Thenoylhydrazone)

Abstract 2Complexes of the types M(H2acacth)cl2 [M = Mn(II), Co(II), Ni(II) and Cu(II)] and M(acacth)(H2O)2 [M = Ni(II), Cu(II) and Zn(II); H2acacth = acetylacetonebis(2-thenoylhydrazone)] have been isolated through template reaction of the metal chloride, acetylacetone (acac) and 2-thenoylhydrazine (th) in neutral and alkaline solutions, respectively. The complexes have been characterized by physico-chemical methods, such as molar conductance, magnetic susceptibility, spectroscopy (IR, NMR, electronic, photoacoustic and ESR) and X-ray powder diffraction.

Studies on N-Salicylidene-2-Aminobenzophenone-2-Thenoylhydrazone Complexes with Some Bivalent Metal Ions

Abstract The chelating behaviour of neutral N-salicylidene-2-aminobenzophenone-2-thenoylhydrazone (H2sabth) and deprotonated sabth has been investigated in the complexes of the types VO(H2sabth)SO4, M(H2sabth)Cl2, VO(sabth) and M(sabth)(H2O)2 [M = Mn(II), Co(II), Ni(II) and Cu(II)]. The complexes have been characterized by elemental analyses, molar conductance, magnetic susceptibility, cyclic voltammetry, F.SR, electronic and IR spectral studies. The stereochemistry of the complexes is discussed.

Studies on Salicylaldehyde-2-aminqbenzophenone-2-furoyl-hydrazone Complexes with 3d Metal Ions

Abstract Complexes having the chemical compositions V0(H2sabfh)2S04, M(H2sabfh)2Cl2 [M = Mn(II), Co(II), Ni(II), Cu(II) and Zn(II)] and M(Hsabfh)2 [M =OV(IV), Mn(II), Co(II), Ni(II), Cu(II) and Zn(II)]; H2sabfh = salicylaldehyde-2-aminobenzophenone-2-furoyl-hydrazone have been prepared and characterized. The complexes are non-electrolytes. Magnetic susceptibility, electronic, esr and ir establish the stereochemistry and mode of bonding of the hydrazone and X-ray diffraction pattern indicates that the zinc(II) complexes belong to the tetragonal unit lattice crystal system.

Synthesis and Physico-Chemical Properties of 2-Aminoaceto-Phenone-2-Furoylhydrazone Complexes

Abstract 2-Aminoacetophenone-2-furoylhydrazone (Haafh) has been synthesized from the reaction, of 2-aminoacetophenone with 2-furoylhydrazine in the presence of catalytic amount of acetic acid. Complexes of OV(IV), Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(ll) and Hg(II) haying the chemical compositions VO(Haafh)2SO4, M(Haafh)2Cl2 and M(aafh)2 have been prepared and characterized by their elemental analyses. The complexes are found to be nonelectrolytes in DMF and MeCN solutions. IR data indicate monodentate bonding of Haafh in VO(Haafh)2SO4, bidentate bonding through the carbonyl oxygen and azomethine nitrogen in M(Haafh)2Cl2, and tridentate bonding through the carbonyl. oxygen, azomethine nitrogen and amine nitrogen in M(aafh)2. The structure of the complexes has been elucidated by vsing magnetic susceptibility, electronic, photoacoustic, esr, ir and nmr (1H and 13C) spectral studies.

Studies on 2-Acetylpyridine-2-aminobenzophenone-2-thenoylhydrazone 3d Metal Complexes

Abstract Complexes VO(Hapabth)2SO4, M(Hapabth)2Cl2 and M(apabth)2 [M = OV(IV), Mn(II), Co(II), Ni(II), Cu(II) and Zn(II), Hapabth = 2-acetylpyridine-2-aminobenzo-phenone-2-thenoylhydrazone and apabth = deprotonato hydrazone] have been prepared. Elemental analyses, molar conductance, magnetic susceptibility, electronic and photoacoustic, e.s.r., i.r. and n.m.r. spectral studies have been used to investigate the structure and bonding of the complexes. X-ray powder diffraction gives shape and size of unit cell of copper(II) and zinc(II) complexes.